There are two options for @mentioning a group of people on an item that are very similar when you are typing: @everyoneonthisboard and @everyoneonthisitem. Because they’re so similar, folks on our team are accidentally choosing @everoneonthisboard and annoying the heck out of everyone (the whole team is on this particular board) because the item isn’t relevant to them. I suggest a rename - or adding two additional @mention options: @subscribers and @assignees.
I agree with the issue of “everyoneonthisboard” causing confusion and hundreds of unnecessary emails to be sent out… however, maybe we can just have this as a setting in the Admin permissions options to limit the users that can use the functionality?